61112 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 70% of adults in 61112 typically vote, above the U.S. average of about 62%. Among adults in 61112, ~32% vote Democratic, ~38% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 61112 compares
Among zip codes within 15 miles, 61112 leans more Republican than 9 of 25 neighbors.
61112 runs about 19 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61112 is one of the few Republican-leaning pockets.
Why 61112 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 61112, not a ranked or complete list of what matters most.
61112 votes Republican even though it is densely developed (about 62%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 61112 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; 61112, IL sits in the top tenth nationally on this measure.
Why turnout in 61112 looks the way it does
Areas with high high-school completion turn out at higher rates. About 98% of adults in 61112 have completed high school, about 6 points above the Illinois average of 92%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Illinois State Board of Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.